Doubt in magnetism

#1


Please solve this

#2

current passing through upper section (A to D) will be \frac{i}{4}.
now use the following formula for finding mangentic feild due to a current carrying wire for section AB,BC and CD
\displaystyle B= \frac{u_{o}i}{4\pi}(sin(\alpha)+sin(\beta))

#3

#4

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